1. Binary to Decimal Conversion
128 64 32 16 8 4 2 1 27 26 25 24 23 22 21 20

2. IP Addresses An IP address in IP version 4 has 32 bits
A computer only knows binary (0s and 1s)
An IP address in IP version 4 has 32 bits
(separated by periods into 4 octets)

3. IP Addresses Dotted decimal format An IP address of 192.168.10.150
 Humans are more familiar with decimal numbers, so we use a
Dotted decimal format
An IP address of
has a Binary equivalent of
Conversion can be done in Windows calculator. Make sure to include any leading zeros to make a full octet.

4. IP Addresses IP Addresses have 2 Parts:
Network Number and Host Number.
In the IP Address
the Network Number is
and the Host Number is 150
The Correct Notation is
and

5. IP Addresses IP Address Classes Class Decimal Binary A 0-126 B C –

6. IP Addresses
In binary, the highest number 8 bits can designate is or 255 in decimal.
IP Class Subnet masks
Class
Subnet mask - Decimal
Subnet mask - Binary A B C

7. IP Addresses
To differentiate between the network portion and the host portion, network administrators use subnet masks.
The default subnet mask for the Class C IP address of is
In binary:

8. Convert decimal to binary in Windows calculator
Go to Start, Run and type in: calc
Type in a decimal number: 100
Click on radio button beside bin (binary) and the binary equivalent will show in the answer box: (7 bits)
Be careful the answer box doesn’t show leading 0s: (8 bits)

9. Ipconfig - Windows 2000 Go to Start, Run and type in cmd
Type in ipconfig /?
Type in ipconfig /all
Type in ipconfig /release
Type in ipconfig /renew

10. PING
Packet Internet Groper (PING) is a utility that can verify that TCP/IP is installed, bound to the NIC, configured correctly, and communicating with the network.
Type ping
Type ping your IP address
Type ping another computer in your network
Type ping your default gateway
Type ping (internet host)

11. An Example
Subnet a Class C network, , into 14 subnets for security, traffic control and multiple locations.
2n - 2 = number of subnets (need minimum of 14 subnets) where n = number of bits borrowed
2?-2 > 14
24-2 = 16
Borrow four bits = subnet mask
Table

12. An Example
Example